:root {
    --primary-color: #0d47a1;
    --primary-hover: #1565c0;
    --text-main: #111827;
    --text-muted: #6b7280;
    --bg-main: #ffffff;
    --bg-light: #f9fafb;
    --bg-dark: #1f2937;
    --border-color: #e5e7eb;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text-main);
    line-height: 1.6;
    background-color: var(--bg-main);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--text-main);
}

h1 { font-size: 3.5rem; margin-bottom: 1.5rem; }
h2 { font-size: 2.25rem; margin-bottom: 1rem; }
h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }
p { color: var(--text-muted); margin-bottom: 1rem; }

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--primary-hover);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    text-decoration: none;
    font-size: 1rem;
    gap: 0.5rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-block {
    width: 100%;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    color: white;
}

.btn-secondary {
    background-color: #f3f4f6;
    color: var(--text-main);
}

.btn-secondary:hover {
    background-color: #e5e7eb;
}

.btn-dark {
    background-color: var(--text-main);
    color: white;
}

.btn-dark:hover {
    background-color: #000;
    color: white;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
}

.btn-outline:hover {
    background-color: var(--bg-light);
}

.link-primary {
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

/* Navbar */
.navbar {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    padding: 1rem 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background-color: var(--bg-light);
    color: var(--primary-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    border: 1px solid var(--border-color);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.875rem;
}

.nav-links a:hover {
    color: var(--text-main);
}

/* Sections */
.section {
    padding: 6rem 0;
}

.bg-light {
    background-color: var(--bg-light);
}

.section-dark {
    background-color: var(--bg-dark);
    color: white;
}

.section-dark h2, .section-dark h3 {
    color: white;
}

.section-dark p {
    color: #9ca3af;
}

.border-top { border-top: 1px solid var(--border-color); }
.border-bottom { border-bottom: 1px solid var(--border-color); }

.section-header {
    margin-bottom: 3rem;
}

.section-header p {
    font-size: 1.125rem;
}

.split-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

/* Hero */
.hero {
    padding: 8rem 0;
    text-align: center;
    background: radial-gradient(circle at top, #f0f4f8 0%, #ffffff 70%);
}

.hero-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: #eff6ff;
    color: #3b82f6;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: 4rem;
    letter-spacing: -0.03em;
    max-width: 800px;
}

.hero p {
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto 2.5rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

/* Layouts */
.two-col {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
}

.align-center {
    align-items: center;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

/* Cards */
.card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.card-dark {
    background: #374151;
    border-color: #4b5563;
}

.card-dark:hover {
    background: #4b5563;
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.bg-blue-light { background: #eff6ff; color: #3b82f6; }
.bg-purple-light { background: #f5f3ff; color: #8b5cf6; }
.bg-green-light { background: #f0fdf4; color: #22c55e; }
.text-blue { color: #60a5fa; }

/* Tags */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-main);
}

/* Projects */
.project-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.project-image {
    width: 100%;
    height: 300px;
    background: var(--bg-light);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-info {
    padding: 2rem;
}

.project-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
}

/* Support Card */
.support-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    max-width: 700px;
    margin-top: 2rem;
    box-shadow: var(--shadow-sm);
}

.support-icon {
    width: 48px;
    height: 48px;
    background: #eff6ff;
    color: #3b82f6;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.support-details {
    flex-grow: 1;
}

.support-details h4 {
    margin-bottom: 0.25rem;
}

.support-details p {
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.support-details a {
    font-weight: 600;
}

/* Contact */
.contact-list {
    list-style: none;
    margin-top: 2rem;
}

.contact-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    color: var(--text-muted);
}

.contact-list svg {
    color: var(--text-main);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.form-group input,
.form-group textarea {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background: var(--bg-light);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 3px rgba(13, 71, 161, 0.1);
}

/* Footer */
.footer {
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-center {
    display: flex;
    gap: 1.5rem;
}

.footer-center a {
    color: var(--text-muted);
}

.footer-center a:hover {
    color: var(--text-main);
}

.footer-right {
    display: flex;
    gap: 1rem;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--bg-light);
    border-radius: 50%;
    color: var(--text-muted);
    transition: all 0.2s ease;
}

.social-icon:hover {
    background: var(--primary-color);
    color: white;
}

/* Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mx-auto { margin-left: auto; margin-right: auto; }
.mb-4 { margin-bottom: 1.5rem; }
.pb-0 { padding-bottom: 0; }
.text-sm { font-size: 0.875rem; }

/* Responsive */
@media (max-width: 992px) {
    .two-col {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero h1 {
        font-size: 3rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .grid-3, .grid-2 {
        grid-template-columns: 1fr;
    }
    
    .split-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .support-card {
        flex-direction: column;
        text-align: center;
    }
    
    .support-details {
        text-align: center;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
}